NICE!
i new it was something like this. thanks
so now....i read up to about 930 rpm and then the faster speeds drop to reading 475 and then back up the line. its like it starts to read in a ratio instead of direct @ 930 and up.
the numbers seem strong and accurate but the rpm rolls over at 930ish and starts reading again at 475 and up.
my little optical switch is reading a .500" slot in a 3" diameter wheel. maybe i need a wider slot?
top gear of the lathe is 1400. i only use about 400 on average though.